EP3079228A1 - A stator core, a stator and a motor - Google Patents

A stator core, a stator and a motor Download PDF

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Publication number
EP3079228A1
EP3079228A1 EP16164178.2A EP16164178A EP3079228A1 EP 3079228 A1 EP3079228 A1 EP 3079228A1 EP 16164178 A EP16164178 A EP 16164178A EP 3079228 A1 EP3079228 A1 EP 3079228A1
Authority
EP
European Patent Office
Prior art keywords
circumferential surface
outer circumferential
protrusion
stator
head part
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP16164178.2A
Other languages
German (de)
English (en)
French (fr)
Inventor
Ja Young Seo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LG Innotek Co Ltd
Original Assignee
LG Innotek Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by LG Innotek Co Ltd filed Critical LG Innotek Co Ltd
Publication of EP3079228A1 publication Critical patent/EP3079228A1/en
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/14—Stator cores with salient poles
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/14—Stator cores with salient poles
    • H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
    • H02K1/148—Sectional cores
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information

Definitions

  • Exemplary embodiments of the present disclosure relate to a stator core, a stator and a motor.
  • an EPS Electronic Power Steering
  • an ECU Electric Control Unit
  • the EPS system can secure turning stability and rapid stability restoring force, such that the driver can drive a vehicle safely.
  • a motor assists a torque of steering wheel operation by the driver, such that the driver can operate the steering wheel with less physical power.
  • the motor may be a BLDC (Brushless Direct Current) motor.
  • Principal components of the BLDC motor are formed of a stator and a rotor, where a coil is wound on the stator and a magnet is coupled to the rotor, such that the rotor can rotate by a mutual electromagnetic interaction.
  • an important characteristic of the EPS motor is that the performance of the motor depends on how a friction torque can be reduced.
  • the friction torque refers to a mechanical or frictional component generated during rotation of the motor.
  • an object of the present disclosure is to solve at least one or more of the above problems and/or disadvantages in whole or in part and to provide at least advantages described hereinafter.
  • At least two stepped areas are provided herein, where the stepped areas are different from each other in their height.
  • the frictional torque can be reduced by reducing the frictional index, when a stator is installed in the housing.
  • a plurality of stator cores comprising: a tooth protruded from a head part, wherein the plurality of stator cores may be adjacent to one another and coupled such that an outer circumferential surface of the head part may form a circular shape, wherein at least two stepped areas may be provided on the head part.
  • a straight direction, from one end of the tooth to the outer circumferential surface of the head part, of the respective stepped area may be different from each other.
  • a motor comprising: a motor housing; a stator including the plurality of stator cores, each including a tooth protruded from a head part; and a rotor rotatably installed at a center of the stator, and including a through-hole formed at a center and a magnet module, wherein at least two stepped areas may be provided at the head part of the stator core, where a straight distance of the respective stepped areas, from one end of the tooth to an outer circumferential surface of the head part, may be different from each other, and wherein any one of the at least two stepped areas may contact an inner circumferential surface of the motor housing.
  • the stator core may include: a head part extended in a circumferential direction; a tooth inwardly extended from the head part; a first protruding part outwardly protruded from an outer circumferential surface of the head part ; and a second protruding part outwardly protruded from an outer circumferential surface of the first protruding part.
  • the first protruding part may include: a first protrusion disposed in a first direction of the circumferential direction from the outer circumferential surface of the head part; and a second protrusion disposed in a second direction opposite to the first direction from the outer circumferential surface of the head part.
  • the first protrusion and the second protrusion may form symmetry around a center of the head part.
  • a length of the first protrusion in the circumferential direction may be longer than a length of the outer circumferential surface of the head part in the circumferential direction.
  • the first protruding part may include an inclined part inclinedly connecting an outer circumferential surface of the head part and an outer circumferential surface of the first protruding part.
  • the second protruding part may include: a third protrusion disposed in the first direction from the first protrusion; and a fourth protrusion disposed in the second direction from the second protrusion.
  • the third protrusion and the fourth protrusion may form symmetry around a center of the head part.
  • a length of the third protrusion in the circumferential direction may be longer than a length of the first protrusion in the circumferential direction, and shorter than a length of the outer circumferential surface of the head part in the circumferential direction.
  • a length of the first protruding part outwardly protruded from the outer circumferential surface of the head part may be longer than a length of the second protruding part outwardly protruded from the outer circumferential surface of the first protruding part.
  • a friction reducing pattern including a plurality of inwardly recessed grooves may be formed at least one of the outer circumferential surface of the head part and the outer circumferential surface of the first protruding part.
  • the stator may comprise: a first stator core; and a second stator core couple to the first stator core in a circumferential direction, wherein the first stator core includes: a head part extended in a circumferential direction; a tooth inwardly extended from the head part; a first protruding part outwardly protruded from an outer circumferential surface of the head part; and a second protruding part outwardly protruded from an outer circumferential surface of the first protruding part.
  • first stator core and the second stator core may be integrally formed.
  • the motor may comprise: a stator core including a head part extended in a circumferential direction, a tooth inwardly extended from the head part, a first protruding part outwardly protruded from an outer circumferential surface of the head part, and a second protruding part outwardly protruded from an outer circumferential surface of the first protruding part; and a housing internally accommodating the stator core, wherein an outer circumferential surface of the second protruding part has an inner contact with an inner circumferential surface of the housing.
  • At least two stepped areas may be provided herein, where the stepped areas are different from each other in their height.
  • the frictional torque can be reduced by reducing the frictional index, when the stator is installed in the housing.
  • FIG. 1 is a plan view illustrating a stator core according to an exemplary embodiment of the present disclosure
  • FIG. 2 is a conceptual view for describing a structure of FIG. 1
  • FIG. 3 is a plan view illustrating a stator according to an exemplary embodiment of the present disclosure.
  • the stator (100) may be formed by continuous coupling of a plurality of stator cores (110).
  • the stator (100) may include a plurality of stator cores (110) having a tooth (112) protruded from a head part (111).
  • the plurality of stator cores (110) may be adjacent to one another, and may be coupled such that an outer circumferential surface of the head part (111) forms a circular shape.
  • at least two stepped areas (a2, a3) may be provided at the head part (111) of the stator core (110), where a straight distance of the respective stepped areas (a2, a3), from an inner end of the tooth (112) to an outer circumferential surface of the head part (111), is different from each other.
  • the stepped area (a2, a3) may be defined as an area each having a different straight distance measured from an inner end (A) to an outer circumferential surface of the head part (111) implementing a curved surface having a predetermined curvature.
  • each of the stepped areas may implement an area of a structure having a predetermined curvature surface.
  • the area contacting a surface of the motor housing may be located higher than another area among the at least two stepped areas, and the lower stepped area may implement a separating area spaced apart from the motor housing, so as to reduce frictional area.
  • two of the stepped areas are implemented at the head part of the stator core.
  • the present disclosure is not limited hereto. Therefore, greater number of stepped areas may be implemented at the stator core.
  • the stepped area (a2, a3) may include a first stepped area (a2) having a bidirectional first curvature surface at a center line (X), and a second stepped area (a3) extended from a distal end of the first stepped area (a2) and having a second curvature surface of which the straight distance is longer than that of the first stepped area (a2).
  • the height of the second stepped area (a3) is higher than that of the first stepped area (a2)
  • the first stepped area (a2) may have a height (straight distance) higher than that of the second stepped area (a3).
  • a stepped groove (a1) formed in a direction to which the tooth (112) is provided may be additionally provided at a position where the center line (X) encounters the outer circumferential surface of the head part (111).
  • the stepped groove (a1) may have a depth deeper than that of the first stepped area (a2).
  • a friction reducing pattern including a plurality of inwardly recessed grooves having a structure similar to that of the stepped groove (a1) may be formed at least one of an outer circumferential surface of the first stepped area (a2) and an outer circumferential surface of the second stepped area (a3). Thereby, frictional index of the surfaces can be further reduced.
  • the stator core (110) having a structure as illustrated in FIG. 1 may implement a structure where a radius (R2) of a virtual circle is different from a radius (R1) of a virtual circle.
  • the radius (R2) refers to a radius of a virtual circle where the curvature surface of the first stepped area (a2) is extended
  • the radius (R1) refers to a radius of a virtual circle where the curvature surface of the second stepped area (a3) is extended.
  • an outer circumferential surface of the stator (100) may correspond to the virtual circle having the radius (R1) as illustrated in FIG. 2 . That is, the second stepped areas (a3) of the adjacently arranged stator cores (110) may all have equal height and curvature, such that height deviation can be eliminated in the combined structure of a plurality of the stator cores (110). Thereby, the friction with the external housing can be reduced.
  • FIG. 4 is a plan view illustrating a partial structure of a motor according to an exemplary embodiment of the present disclosure
  • FIG. 5 is an enlarged perspective view illustrating by enlarging a part of a motor according to an exemplary embodiment of the present disclosure.
  • TABLE 1 shows a result of friction torque comparison between an exemplary embodiment implementing the stepped areas (a2, a3) of the present disclosure and a comparative embodiment, under the condition that a stator core (110) of the same standard is provided.
  • the first stepped area (a2) formed a 5 mm section in left and right directions on the basis of the center line (X).
  • 30 rpm of driving power is equally applied in the experiment.
  • Friction Torque (30 rpm) Comparative Embodiment Exemplary Embodiment CW CCW CW CCW #Sample 1 16.88 16.59 12.97 12.69 #Sample 2 17.57 17.13 13.66 13.09 #Sample 3 16.41 16.25 13.27 12.58 AVE 16.95 16.66 13.30 12.79
  • the friction torque can be reduced to a maximum of 25%, when the stator core (110) of the same standard employs the stepped areas (a2, a3) according to an exemplary embodiment of the present disclosure.
  • an example of an EPS (Electronic Power Steering) motor employing the stator core for a motor according to an exemplary embodiment of the present disclosure will be described, with reference to FIG. 7 .
  • the stator core (110) according to the exemplary embodiment may be applied to various types of motor.
  • an EPS motor is described as an example.
  • a motor housing (500) and a bracket (30) coupled to the housing (500) may be provided.
  • An upper surface of the housing (500) may be opened, and a support pipe (11) may be protruded from a center of a lower surface of the housing (500).
  • a first bearing (31) may be installed at the support pipe (11), and a second bearing (32) may be installed at the bracket (30).
  • a shaft (400) may contact and support the first bearing (31) and the second bearing (32).
  • An upper portion of the shaft (400) may be supported by the second bearing (32), and a lower portion of the shaft (400) may be supported by the first bearing (31).
  • a stator (100) and a rotor (300) may be installed inside of the housing (500).
  • the rotor (300) may include a rotor core (320) coupled to the shaft (400), and a magnet (310) coupled to an outer circumferential surface of the rotor core (320).
  • a structure where the magnet (310) is coupled to an outer circumferential surface of the rotor core (320) is suggested in the present exemplary embodiment, alternatively, another structure where the magnet (310) is inserted in the rotor core (320) may also be applied.
  • the stator (100) may include a stator core (110) arranged between the magnet (310) and the housing (110), and a coil (120) wound on the stator core (110).
  • the stepped areas (a2, a3) as previously described in FIGS. 1 to 5 may be applied to the stator core (110) composing the stator (100).
  • the shaft (400) may rotate by interaction between a magnetic field generated from the stator (100) and a magnetic field generated from the rotor (300).
  • a sensing plate (40) may be coupled to the shaft (400) to rotate with the shaft (400), and a sensing magnet (50) may be installed at the sensing plate (40).
  • a circuit board (10) may be installed at the bracket (30), and a sensing element (20) facing the sensing magnet (50) may be installed at the circuit board (10).
  • the sensing element (20) may sense a rotation extent of the sensing magnet (50), so as to sense rotation extents of the sensing plate (40) couple with the sensing magnet (50) and the shaft (400).
  • the stator core (110) may include a head part (111), a tooth (112), a first protruding part (114), and a second protruding part (115).
  • the stator core (110) may include a head part (111) extended in a circumferential direction.
  • the stator core (110) may include a tooth (112) inwardly extended from the head part (111).
  • the stator core (110) may include a first protruding part (114) outwardly protruded from an outer circumferential surface (113) of the head part (111).
  • the stator core (110) may include a second protruding part (115) outwardly protruded from an outer circumferential surface of the first protruding part (114).
  • the first protruding part (114) may include a first protrusion (114a) and a second protrusion (114b).
  • the first protruding part (114) may include: a first protrusion (114a) disposed in a first direction of the circumferential direction from the outer circumferential surface (113) of the head part (111); and a second protrusion (114b) disposed in a second direction opposite to the first direction from the outer circumferential surface (113) of the head part (111).
  • first protrusion (114a) and the second protrusion (114b) may form symmetry around a center of the head part (111).
  • a length of the first protrusion (114a) in the circumferential direction may be longer than a length of the outer circumferential surface (113) of the head part (111) in the circumferential direction.
  • the first protruding part (114) may include an inclined part (116) inclinedly connecting an outer circumferential surface (113) of the head part (111) and an outer circumferential surface of the first protruding part (114).
  • the second protruding part (115) may include a third protrusion (115a) and a fourth protrusion (115b).
  • the second protruding part (115) may include: a third protrusion (115a) disposed in the first direction from the first protrusion (114a); and a fourth protrusion (115b) disposed in the second direction from the second protrusion (114b).
  • the third protrusion (115a) and the fourth protrusion (114b) may form symmetry around a center of the head part (111).
  • a length of the third protrusion (115a) in the circumferential direction may be longer than a length of the first protrusion (114a) in the circumferential direction and shorter than a length of the outer circumferential surface (113) of the head part (111) in the circumferential direction.
  • a length of the first protruding part (114) outwardly protruded from the outer circumferential surface (113) of the head part (111) may be longer than a length of the second protruding part (115) outwardly protruded from the outer circumferential surface of the first protruding part (114).
  • a friction reducing pattern including a plurality of inwardly recessed grooves may be formed at least one of the outer circumferential surface (113) of the head part (111) and the outer circumferential surface of the first protruding part (114).
  • the stator (100) may be formed by a structure where a plurality of the stator cores (110) is arranged in a circumferential direction.
  • the plurality of the stator cores (110) may be integrally formed.
  • the motor may include the stator (100), and the housing (500) internally accommodating the stator (100).
  • an outer circumferential surface of the second protruding part (115) may have an inner contact with an inner circumferential surface of the housing (500).
  • an external diameter of the 5 mm sections at both sides is reduced such that an area contacting the housing (500) can be reduced to form an air gap.
  • a plurality of the stator cores (110) is gathered and assembled by being indented with the housing (500), such that only eighteen sections contact the housing (500) and the rest sections form air gaps to reduce the friction torque. That is, in the present exemplary embodiment, the air gaps between the housing (500) and the stator (100) are obtained to reduce the friction torque.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
EP16164178.2A 2015-04-07 2016-04-07 A stator core, a stator and a motor Withdrawn EP3079228A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020150049105A KR101940682B1 (ko) 2015-04-07 2015-04-07 스테이터 및 이를 포함하는 모터

Publications (1)

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EP3079228A1 true EP3079228A1 (en) 2016-10-12

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EP16164178.2A Withdrawn EP3079228A1 (en) 2015-04-07 2016-04-07 A stator core, a stator and a motor

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US (3) US10224765B2 (ko)
EP (1) EP3079228A1 (ko)
KR (1) KR101940682B1 (ko)
CN (4) CN106059238B (ko)

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US11942849B2 (en) 2018-08-30 2024-03-26 Lg Innotek Co., Ltd. Motor
KR20200086087A (ko) * 2019-01-08 2020-07-16 엘지이노텍 주식회사 모터
JP7167849B2 (ja) * 2019-05-21 2022-11-09 株式会社デンソー ステータアセンブリ、及び、モータ
KR20210042619A (ko) * 2019-10-10 2021-04-20 엘지이노텍 주식회사 모터
JP7084451B2 (ja) * 2020-08-11 2022-06-14 シナノケンシ株式会社 固定子コア及びモータ

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Also Published As

Publication number Publication date
CN112671198A (zh) 2021-04-16
US10224765B2 (en) 2019-03-05
KR20160120068A (ko) 2016-10-17
US20190148996A1 (en) 2019-05-16
US10700559B2 (en) 2020-06-30
CN106059238B (zh) 2021-02-05
US20160301266A1 (en) 2016-10-13
CN106059238A (zh) 2016-10-26
CN112510860A (zh) 2021-03-16
KR101940682B1 (ko) 2019-01-22
CN112671197A (zh) 2021-04-16
US20200328633A1 (en) 2020-10-15
US11349355B2 (en) 2022-05-31

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